Mopar 4893926AH is the thermostat housing assembly, thermostat included, for the JL's 3.6 Pentastar. The JK's plastic housing is a famous leaker, and JL owners searching for a fix often land on JK parts by mistake. The Dorman 902-852 and Mopar 5184651AJ are JK parts and don't fit the JL.
Fitment
2018-and-later Wrangler JL with the 3.6 Pentastar, per Mopar parts catalogs. It's a different housing from the JK's, with a different bolt pattern. Always confirm the number on your old part or run your VIN at a Mopar parts counter before you order.
Common failure symptoms
- Coolant weep or crust at the housing on the front of the engine
- Coolant level dropping with no obvious leak
- Temperature gauge running low and weak heat (thermostat stuck open)
- Overheating if the thermostat sticks closed
Cross-reference
| Brand | Part number | Notes | Source |
|---|---|---|---|
| Mopar | 4893926AH | Current. Replaces 4893926AD, AF and AG. Includes the thermostat. | source |
Rebuild, repair or replace?
Buy the full assembly. Make sure the replacement matches your engine. The JL 3.6 isn't the same as the JK 3.6, and buying a JK housing is the most common mistake. JL Wranglers use the 10-year/150,000-mile OAT coolant, so top off or refill with the same formula, such as Mopar 68163849AB premix. The 3.6 traps air, so bleed the system carefully afterward. The spill-free funnel method in our JK housing guide works the same way here.
Where to buy
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FAQ
Can I use the Dorman 902-852 on a JL?
No. It's a JK part with a different bolt pattern.
Does 4893926AH include the thermostat?
Yes, it's sold as a housing and thermostat assembly.
Which coolant does a JL use?
Mopar 10-year/150,000-mile OAT, the same formula as 2013–2018 JKs.
Related guides
Sources
Part numbers and fitment were checked against the sources above on October 22, 2026. Mopar supersedes numbers over time. If a newer letter suffix shows up, it generally replaces the one listed here. Back to the parts lookup.